Correct Answer: Veins

Solution : The correct option is Veins .

Veins are the vessels that carry carbon dioxide-rich blood back to the heart. In the circulatory system, arteries carry oxygenated blood away from the heart to the body's tissues, while veins return deoxygenated blood, which is rich in carbon dioxide, from the body's tissues back to the heart. This deoxygenated blood is then pumped to the lungs for oxygenation, and the cycle continues as part of the circulatory process.